Improved machine for nicking screw-blanks



Mabhine for Nicking Screw Blanks.

Patented July 26, 1870.

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' AURIN WOOD, on wononsrnn, MASSACHUSETTS.

IMPROVED MACHIN E FOR NICKING SCREW-BLANKS.

specificationforming part of Letters Patent No. 105,873, dated July 26,1870.

To all whom it may concera:

Be it known that I, AURIN W001), of the city and county of Worcester,and Commonv wealth of Massachusetts, have invented certain new anduseful Improvements in Ma; chines for Nicking Screws, and for otherpurposes; and I, do hereby declare that the fol lowing is a full, clear,and exact description of the same, reference being had to theaccompanying drawing, forming a part of this specification, in which l lFigure 1 represents a plan view of my improved machine for nickingscrews. Fig. 2 represents a front view, with the faceplate re- -movedfrom one of the, guide-blocks to more fully show the construction. Fig.3 represents a view of the right-hand side; and Fig. 4 represents acentral section on line A B, Fig. 1.

To enable those skilled in the art to which my invention belongs to makeand use the same, I will proceed to describe it more in detail. i In.the drawing, he part marked A is the bed or frame of the machine, and issupported upon suitable standards A. Upon the top of the bed A arearranged guide-blocks B, that support the adjustable bearings 0, whereinwork the sliding bars D, which carry the cutting-tools a. The upper andlower edges of the bearing-pieces G are inclined, as are also thebearing-seats in the guide-blocks 13, while the grooves for the slidingbars D are formed straight across the bearings C, so that by moving thebearing-pieces G from right to left the sliding bars D and cutting-toolswill be raised or depressed, as the case may be, without changing thedirections of their motion. The two bearings G are joined for operationby means of the connecting-rod E, to the ends of which said bearings areattached by means of pins 1) b, which pass through slots formed in 'therear side of the guide-blocks B, as indicated' in the drawing. One ofthe pins, 11, is prolonged, and works between the forks c, attached tothe end of a rock-shaft, F; and the bearings 0 are adjustedautomatically by means of a grooved cam, G,.on the back shaft, H, andwhich cam actuates the rock-shaft F, the latter being provided with acrank, 11, the pin of which travels in the groove of the cam G. 4

The cutting-tools a a are secured in headblocks I I, which latter arepivoted to the ends of the sliding bars D, as indicated at 2 2; and thebars D are connected to each other for operation by means of aconnecting-rod, J, that extends across the machine in rear of theguide-blocks B, and is secured to studs 0 e, fixed in the outer ends ofthe slide-bars D. One of the studs, c, is connected by means of apitman, K, to a crank, L, on the end of a drivingshaft, M, which shaftis arranged transversely at the right-hand end of the machine andsupported in the bearings g, as indicated in the drawing. As the shaft Mrevolves, the slidebars D are reciprocated, carryingthe cuttingtoolsright and left across the work, one tool cutting while the other isreturning, and thereby losing no time.

The guide-blocks B are, in this instance, set M somewhat inclined from avertical position, the right-hand block being inclinedto the rear andthe left-hand block to the front, whereby the cutting-tools are broughtin such position that they will out a dovetailed nick inv the screwhead,said nick being wider at the bottom than at the top. If preferred,however, the guideblocks may be set in a vertical position.

The groove of the cam G is so formed that the cutting-tools a will begradually depressed until the nick in the screw-head is formed ofsufficient depth, and will then be quickly raised to. clear them fromthe nick while the screw is being discharged and replaced.

The screw-blanks are carried beneath the cutters, and there held duringthe operation of nicking, and afterward discharged by means of a pair ofsegmental clamps, N N, which are pivoted upon vertical studs f f,projecting from the bed A.

The faces of the clamps N N are each provided with a semi-cylindricalvertical groove, of the proper size and form to fit the screwblank, andin which the blank is firmly held by the pressure of the clamps N N.

The faces of the clamps N N, at the rear of the groove, are furnishedwith cogs or teeth 2', to insure uniform action between the two, andthey are caused. to roll back and forward by the action of a cam, 0,arranged upon the back shaft, H, which shaft receives its motion fromthe driving-shaft M through the worm V and worm-gear W.

The cam O has a groove, 3, in its side, in

which travels an operating-pin that projects from the slide it, whichlatter is arranged in the bearings 70 in such a manner that it will moveback and forth horizontally with an intermittent motion as the camrevolves.

One of the clamps, N, is connected to the front end of the slide h bymeans of a hinged connection piece, m, so that when the slide movesforward, the clamps will swing to the front far enough to bring thesemi-cylindrical groove in the clamp N in conjunction with the end ofthe chute in the inclined hopper 1?, wherein are fed the screw-blanks n.

Theblanksn n are causedbytheir own weight to slide down the inclines,and the first blank, n, drops into the groove in the face of the clampN, and as said clamp swings back the blank 02 is carried with it, theblank being meanwhile held against the clamp by the yieldin gguide-sprin g R until the clamp has swung far enough back to admit ofthe blank being caught by the grooves in the opposite clamp, when it ispressed firmly between the two clamps, and stops directly beneath thecutters a, where it is held until properly nicked; and as the clamps N Nagain move forward, the blank passes outside of the spring R, and bein gthereby separated from the grooves of the clamps, it is free to dropdown through the opening S into any suitable receptacle placed beneathto receive it.

A recess is formed through the first two cogs of the clamps N, so as notto interfere with the spring R as the clamp swings forward.

A spring, T, is, in this instance, arranged at the side of the hopper,to keep the blanks in a perpendicular position, and to prevent more thanone blank from being drawn out at a time; but, if preferred, the springB may be made of such forms as to supersede use of the spring.

Instead of using two slide-bars, D D, a single bar may be used, in whichcase I should prefer to have it extend through the bearing 0.

Having described my improved machine for nicking screws, what I claimtherein as new and of my invention, and desire to secure by LettersPatent, is-

1. The combination, with the bed or frame A, of the sliding bars D D andreciprocating inclined bearings O O, which automatically raise anddepress the cutters, substantially as and for the purposes set forth.

2. The combination, with the cutters and sliding bars D andsegmental-gear clamps, of the inclined hopper]? and separating-sprin gR, substantially as described.

3. The combination, with the segmental-gear clamps N N, of theseparating-sprin g R, which also guides the screw from the hopper to thesegmental-gear clamps, substantially as described.

4. The combination, with the sliding bars D and driving-shaft M, of thecrank L, pitman K, and connection J, substantially as shown anddescribed.

5. The combination, with the segmental-gear clamps, constructed asdescribed, and cam O, of the connecting-bar m and slide h, arranged inrelation to each other as shown and described.

6. The combination, with the inclined bearings G, connecting-rod E, andpins b I), of the rock-shaft Fand cam Gr, substantially as shown anddescribed.

AURIN WOOD.

Witnesses:

Tnos. H. DODGE, ALBERT E. Pnmcn.

